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Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investment Securities
Total investment securities available-for-sale, Amortized Cost	$ 796,917	$ 781,232
Gross Unrealized Gains	17,683	13,955
Gross Unrealized Losses	(342)	(3,460)
Investment securities, available-for-sale	814,258	791,727
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost
Due in one year or less	214,503
Due after one year through five years	318,873
Due after five years through ten years	22,113
Due after ten years	0
Mortgage-backed securities	239,829
Total debt securities available-for-sale	795,318
Contractual maturities of investments in debt securities available-for-sale, Fair Value
Due in one year or less	215,323
Due after one year through five years	324,549
Due after five years through ten years	22,717
Due after ten years	0
Mortgage-backed securities	244,539
Total debt securities available-for-sale	807,128
U.S. Treasury and Federal agencies securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	396,740	389,457
Gross Unrealized Gains	3,396	1,718
Gross Unrealized Losses	(5)	(1,506)
Investment securities, available-for-sale	400,131	389,669
U.S. States and political subdivisions securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	125,917	120,441
Gross Unrealized Gains	3,364	2,692
Gross Unrealized Losses	(63)	(143)
Investment securities, available-for-sale	129,218	122,990
Mortgage-backed securities - Federal agencies
Investment Securities
Total investment securities available-for-sale, Amortized Cost	239,829	234,400
Gross Unrealized Gains	4,982	3,430
Gross Unrealized Losses	(272)	(1,533)
Investment securities, available-for-sale	244,539	236,297
Corporate debt securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	32,032	34,241
Gross Unrealized Gains	398	199
Gross Unrealized Losses	0	(57)
Investment securities, available-for-sale	32,430	34,383
Foreign government and other securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	800	800
Gross Unrealized Gains	10	10
Gross Unrealized Losses	0	(1)
Investment securities, available-for-sale	810	809
Total debt securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	795,318	779,339
Gross Unrealized Gains	12,150	8,049
Gross Unrealized Losses	(340)	(3,240)
Investment securities, available-for-sale	807,128	784,148
Marketable equity securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	1,599	1,893
Gross Unrealized Gains	5,533	5,906
Gross Unrealized Losses	(2)	(220)
Investment securities, available-for-sale	$ 7,130	$ 7,579

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